Book/Report

FZJ-2018-01372

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Untersuchungen zur Struktur des doppeltmagischen Kerns $^{132}$SN

Lauppe, W.-D. (Corresponding author)FZJ*

1979
Kernforschungsanlage Jülich, Verlag Jülich

Please use a persistent id in citations: http://hdl.handle.net/2128/17456

Report No.: Juel-1605

Abstract: The decay of an us-isomer in the doubly magic nucleus $^{132}_{82}$Sn$_{50}$ is investigated with the fission product separator JOSEF at the nuclear research reactor FRJ 2 (DIDO) in the Kernforschungsanlage Jülich. The separation of $^{132}$Sn from the fission product mixture of a thermal neutron irradiated $^{235}$U-target is performed with a gas-filled fission product separator. The unslowed fission products are separated within 1 - 2 $\mu$s according to nuclear charge and mass. The short separation time allowed the investigation of isomeric states, populated directly in fission, with a half-life > 1 $\mu$s. A gamma line of 4041 keV is assigned to the decay of an isomeric state in $^{132}$Sn. The half-life of the isomeric state is determined by delayed fission product, gamma-coincidences. Gamma, gamm-coincidence measurements reveal the existence of four other gamma transitions, following the decay of the isomer. The evaluation of delayed gamma, gamma-coincidences allows the determination of the life-time for another state. According to the measured data a level scheme of $^{132}$Sn is established. The level scheme is discussed within the framework of the spherical shell model. For this purpose the experimental level scheme is compared with the results of RPA calculations performed with two sets of input parameters. The fairly good agreement between the experimental and theoretical values allows the proposal of the spins and parities of three excited states.

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Contributing Institute(s):

1. Publikationen vor 2000 (PRE-2000)

Research Program(s):

1. 899 - ohne Topic (POF3-899) (POF3-899)

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